11.7 to 1 C.R. race gas engine that probably has very little low end power, coil over teeth rattling racing suspension, short track high RPM highway engine speed gears, no heater, yeah you could drive it on the street, it would get old real quick. This is a great track car.
"Lots happened in 4 years. Plans changed, car is now being migrated as funds become available for HSR racing while building experience doing DEs. The engine and suspension upgrades makes it a dedicated track car but fun to drive." quoted from post #89 by the very honest and rightful proud owner in this thread
http://forums.pelicanparts.com/porsche-911-technical-forum/381843-darth-vaders-helmet-5.html
Once again very cool car that was built right and would take way more to duplicate, but the answer for why it has not sold, is, it is a very limited use Porsche without dumping more money in it .